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Behind the Lens by Jay Holben

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3.8Seeing the Invisible, Part II: Dealing with Infrared Contamination (Arri Alexa Test)

In last month’s column, I discussed the problems of infrared contamination with digital cameras. We went into the problems of IR radiation, especially when you severely attenuate light with neutral density filters. A couple of months ago I spent a day at Camtec Motion Picture Cameras with cinematographers Christopher Probst, Phil Holland and Jesse Brunt to test a number of infrared cutting filters on both the Red Epic and the Arri Alexa. This month will look back at that test again and see the results of our filters on the Alexa. (For a detail of filters tested and methodology, see the previous article.)

I’ll reiterate that although some of these filters are ...

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